The only reason it shouldn't update that are common. Either it should get a location in UpdateScopePosition, or it should fail in both cases, as that code is at the very front, do you have any: Error reading RA/DEC. messages?
I'd very much like to get a debug log if you don't mind, because I can't seem to reproduce what you have.
I do discover some odd behaviour with parking on a (fake) alt-az mount, namely that it seems sometimes to goto after an unpark?! (To where it was before the park.) Never have seen that on an EQ. I'm looking at it, but a log would be great to try to figure it out. I do seem to recall that as being something a while back though that I'd very occasionally encounter on startup?